Photodetectors and photovoltaics based on semiconductor nanocrystals

Abstract

A composite material is described. The composite material comprises semiconductor nanocrystals, and organic molecules that passivate the surfaces of the semiconductor nanocrystals. One or more properties of the organic molecules facilitate the transfer of charge between the semiconductor nanocrystals. A semiconductor material is described that comprises p-type semiconductor material including semiconductor nanocrystals. At least one property of the semiconductor material results in a mobility of electrons in the semiconductor material being greater than or equal to a mobility of holes. A semiconductor material is described that comprises n-type semiconductor material including semiconductor nanocrystals. At least one property of the semiconductor material results in a mobility of holes in the semiconductor material being greater than or equal to a mobility of electrons.

1 . A composite material comprising:
 semiconductor nanocrystals; and   organic molecules having a bidentate form configured to cross-link the semiconductor nanocrystals.   
     
     
         2 . The material according to  claim 1 , wherein the organic molecules facilitate a transfer of charge between the semiconductor nanoparticles. 
     
     
         3 . The material according to  claim 1 , wherein the organic molecules passivate respective surfaces of the semiconductor nanocrystals. 
     
     
         4 . The material according to  claim 1 , wherein the organic molecules comprise first and second functional end groups that define the bidentate form, and a conjugated moiety coupled between the first and second functional groups. 
     
     
         5 . The material according to  claim 1 , wherein the organic molecules comprise a benzene ring. 
     
     
         6 . The material according to  claim 5 , wherein the organic molecules comprise at least one organic compound chosen from a list of organic compounds consisting of benzenedithiol, dibenzenedithiol, mercaptobenzoic acid, dicarboxybenzene, benzenediamine, and dibenzenediamine. 
     
     
         7 . The material according to  claim 6 , wherein the organic molecules comprise benzenedithiol. 
     
     
         8 . The material according to  claim 1 , wherein the semiconductor nanocrystals include at least one compound chosen from a list of compounds consisting of PbS, PbSe, PbTe, CdS, CdSe, CdTe, SnS, SnSe, SnTe, Si, GaAs, Bi 2 S 3 , Bi 2 Se 3 , CuInS 2 , CuInSe 2 , Cu(InGa)Se 2  (CIGS), and CuGaSe 2 . 
     
     
         9 . An electronic device, comprising:
 first and second electrodes; and   a film in contact with the first and second electrodes and comprising semiconductor nanocrystals and organic molecules having a bidentate form configured to cross-link the semiconductor nanocrystals.